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Abstract

AbstractWe revise the large Neotropical genus Operclipygus Marseul, in the histerid tribe Exosternini (Histeridae: Histerinae). We synonymize 3 species, move 14 species from other genera, sink the genus Tribalister Horn into Operclipygus, and describe 138 species as new, bringing the total to 177 species of Operclipygus. Keys are provided for the identification of all species, and the majority of the species are illustrated by habitus and male genitalia illustrations. The species are diverse throughout tropical South and Central America, with only a few species extending into the temperate parts of North America. The majority of species can be recognized by the presence of a distinct stria or sulcus along the apical margin of the pygidium, though it is not exclusive to the genus. Natural history details for species of Operclipygus are scant, as most specimens have been collected through the use of passive flight interception traps. Many are probably generally associated with decaying vegetation and leaf litter, where they prey on small arthropods. But a small proportion are known inquilines, with social insects such as ants and termites, and also with some burrowing mammals, such as Ctenomys Blainville. The genus now includes the following species groups and species: Operclipygus sulcistrius group [Operclipygus lucanoidessp. n., Operclipygus schmidtisp. n., Operclipygus simplistriussp. n., Operclipygus sulcistrius Marseul, 1870], Operclipygus mirabilis group [Operclipygus mirabilis (Wenzel & Dybas, 1941) comb. n., Operclipygus pustulifersp. n., Operclipygus plaumannisp. n., Operclipygus sinuatussp. n., Operclipygus mutucasp. n., Operclipygus carinistrius (Lewis, 1908) comb. n., Operclipygus parensissp. n., Operclipygus schlingerisp. n.], Operclipygus kerga group [Operclipygus kerga (Marseul, 1870), Operclipygus planifronssp. n., Operclipygus punctistriussp. n.], Operclipygus conquisitus group [Operclipygus bicolorsp. n., Operclipygus conquisitus (Lewis, 1902), Operclipygus friburgius (Marseul, 1864)], Operclipygus impuncticollis group [Operclipygus bickhardtisp. n., Operclipygus britannicussp. n., Operclipygus impuncticollis (Hinton, 1935)], Operclipygus panamensis group [Operclipygus crenatus (Lewis, 1888), Operclipygus panamensis (Wenzel & Dybas, 1941)], Operclipygus sejunctus group [Operclipygus depressus (Hinton, 1935), Operclipygus itoupesp. n., Operclipygus juninensissp. n., Operclipygus peckisp. n., Operclipygus punctiventersp. n., Operclipygus sejunctus (Schmidt, 1896) comb. n., Operclipygus setiventrissp. n.], Operclipygus mortavis group [Operclipygus ecitonissp. n., Operclipygus mortavissp. n., Operclipygus paraguensissp. n.], Operclipygus dytiscoides group [Operclipygus carinisternussp. n., Operclipygus crenulatussp. n., Operclipygus dytiscoidessp. n., Operclipygus quadratussp. n.], Operclipygus dubitabilis group [Operclipygus dubitabilis (Marseul, 1889), Operclipygus yasunisp. n.], Operclipygus angulifer group [Operclipygus angulifersp. n., Operclipygus impressifronssp. n.], Operclipygus dubius group [Operclipygus andinussp. n., Operclipygus dubius (Lewis, 1888), Operclipygus extraneussp. n., Operclipygus intermissussp. n., Operclipygus lunulussp. n., Operclipygus occultussp. n., Operclipygus perplexussp. n., Operclipygus remotussp. n., Operclipygus validussp. n., Operclipygus variabilissp. n.], Operclipygus hospes group [Operclipygus assimilissp. n., Operclipygus belemensissp. n., Operclipygus bulbistomasp. n., Operclipygus callifronssp. n., Operclipygus colombicussp. n., Operclipygus communissp. n., Operclipygus confertussp. n., Operclipygus confluenssp. n., Operclipygus curtistriussp. n., Operclipygus diffluenssp. n., Operclipygus fusistriussp. n., Operclipygus gratussp. n., Operclipygus hospes (Lewis, 1902), Operclipygus ibiscussp. n., Operclipygus ignifersp. n., Operclipygus impositussp. n., Operclipygus incisussp. n., Operclipygus innocuussp. n., Operclipygus inquilinussp. n., Operclipygus minutussp. n., Operclipygus novateutoniaesp. n., Operclipygus praecinctussp. n., Operclipygus prominenssp. n., Operclipygus rileyisp. n., Operclipygus subterraneussp. n., Operclipygus tenuissp. n., Operclipygus tiputinussp. n.], Operclipygus farctus group [Operclipygus atlanticussp. n., Operclipygus bidessois (Marseul, 1889), Operclipygus distinctus (Hinton, 1935), Operclipygus distractus (Schmidt, 1896) comb. n., Operclipygus farctissimussp. n., Operclipygus farctus (Marseul, 1864), Operclipygus gillisp. n., Operclipygus impressistriussp. n., Operclipygus inflatussp. n., Operclipygus latemarginatus (Bickhardt, 1920) comb. n., Operclipygus petrovisp. n., Operclipygus plicatus (Hinton, 1935) comb. n., Operclipygus prolixussp. n., Operclipygus punctifronssp. n., Operclipygus proximussp. n., Operclipygus subrufussp. n.], Operclipygus hirsutipes group [Operclipygus guianensissp. n., Operclipygus hirsutipessp. n.], Operclipygus hamistrius group [Operclipygus arquussp. n., Operclipygus campbellisp. n., Operclipygus chiapensissp. n., Operclipygus dybasisp. n., Operclipygus geometricus (Casey, 1893) comb. n., Operclipygus hamistrius (Schmidt, 1893) comb. n., Operclipygus impressicollissp. n., Operclipygus intersectussp. n., Operclipygus montanussp. n., Operclipygus nubosussp. n., Operclipygus pichinchensissp. n., Operclipygus propinquussp. n., Operclipygus quinquestriatussp. n., Operclipygus rubidus (Hinton, 1935) comb. n., Operclipygus rufescenssp. n., Operclipygus troglodytessp. n.], Operclipygus plicicollis group [Operclipygus cephalicussp. n., Operclipygus longidenssp. n., Operclipygus plicicollis (Schmidt, 1893)], Operclipygus fossipygus group [Operclipygus disconnectussp. n., Operclipygus fossipygus (Wenzel, 1944), Operclipygus foveipygus (Bickhardt, 1918), Operclipygus fungicolus (Wenzel & Dybas, 1941), Operclipygus gibbulus (Schmidt, 1889) comb. n., Operclipygus olivensissp. n., Operclipygus simplicipygussp. n., Operclipygus subdepressus (Schmidt, 1889), Operclipygus therondi (Wenzel, 1976)], Operclipygus impunctipennis group [Operclipygus chamelensissp. n., Operclipygus foveiventrissp. n., Operclipygus granulipectussp. n., Operclipygus impunctipennis (Hinton, 1935) comb. n., Operclipygus latifoveatussp. n., Operclipygus lissipygussp. n., Operclipygus maesisp. n., Operclipygus mangiferussp. n., Operclipygus marginipennissp. n., Operclipygus nicodemussp. n., Operclipygus nitidussp. n., Operclipygus pacificussp. n., Operclipygus pauperculussp. n., Operclipygus punctissipygussp. n., Operclipygus subviridissp. n., Operclipygus tripartitussp. n., Operclipygus voraxsp. n.], Operclipygus marginellus group [Operclipygus asheisp. n., Operclipygus baylessaesp. n., Operclipygus dentatussp. n., Operclipygus formicatussp. n., Operclipygus hintonisp. n., Operclipygus marginellus (J.E. LeConte, 1860) comb. n., Operclipygus orchidophilussp. n., Operclipygus selvorumsp. n., Operclipygus striatellus (Fall, 1917) comb. n.], incertae sedis: O. teapensis (Marseul, 1853) comb. n., Operclipygus punctulatussp. n., Operclipygus lama Mazur, 1988, Operclipygus florifaunensissp. n., Operclipygus bosquesecussp. n., Operclipygus arnaudi Dégallier, 1982, Operclipygus subsphaericussp. n., Operclipygus latipygussp. n., Operclipygus elongatussp. n., Operclipygus rupicolussp. n., Operclipygus punctipleurussp. n., Operclipygus falinisp. n., Operclipygus peregrinussp. n., Operclipygus brooksisp. n., Operclipygus profundipygussp. n., Operclipygus punctatissimussp. n., Operclipygus cavisternussp. n., Operclipygus siluriformissp. n., Operclipygus parallelussp. n., Operclipygus abbreviatussp. n., Operclipygus pygidialis (Lewis, 1908), Operclipygus faltistriussp. n., Operclipygus limonensissp. n., Operclipygus wenzelisp. n., Operclipygus iheringi (Bickhardt, 1917), Operclipygus angustisternus (Wenzel, 1944), Operclipygus shortisp. n. We establish the following synonymies: Phelisteroides miladae Wenzel & Dybas, 1941 and Pseudister propygidialis Hinton, 1935e = Operclipygus crenatus (Lewis, 1888); Phelister subplicatus Schmidt, 1893b = Operclipygus bidessois (Marseul, 1889). We designate lectotypes for Operclipygus sulcistrius Marseul, 1870, Phelister carinistrius Lewis, 1908, Phelister kerga Marseul, 1870, Phelister friburgius Marseul, 1864, Phelister impuncticollis Hinton, 1935, Phelister crenatus Lewis, 1888, Phelister sejunctus Schmidt, 1896, Pseudister depressus Hinton, 1935, Epierus dubius Lewis, 1888, Phelister hospes Lewis, 1902, Phelister farctus Marseul, 1864, Phelister bidessois Marseul, 1889, Phelister subplicatus Schmidt, 1893, Phelister plicatus Hinton, 1935, Phelister distinctus Hinton, 1935, Phelister distractus Schmidt, 1896, Pseudister latemarginatus Bickhardt, 1920, Phelister hamistrius Schmidt, 1893, Phelister plicicollis Schmidt, 1893, Phelister gibbulus Schmidt, 1889, Phelister subdepressus Schmidt, 1889, Phelister teapensis Marseul, 1853, Phelister pygidialis Lewis, 1908, Phelister iheringi Bickhardt, 1917, and Phelister marginellus J.E. LeConte 1860. We designate a neotype for Operclipygus conquisitus Lewis, replacing its lost type specimen.

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